[WICKET-6267] Native Websocket exception when the page is expired

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 7.3.0
• Fix Version/s: 7.6.0, 8.0.0-M3
• Component/s: wicket-native-websocket
• Environment: Linux, tomcat 8.5.5
• Assignee: Martin Tzvetanov Grigorov
• Reporter: Peter Henderson
• Created: 03/Nov/16 11:33
• Updated: 04/Jan/17 09:43
• Resolved: 08/Nov/16 12:12

Description

I have a Servlet session listener. When a session is destroyed a web socket broadcast message is sent (from a background worker thread). This can result in exception

2016-11-03 11:26:07.245 SEVERE oawpwa.AbstractWebSocketProcessor An error occurred during processing of a WebSocket message
java.lang.IllegalArgumentException: Argument 'component' may not be null.
at org.apache.wicket.util.lang.Args.notNull(Args.java:41)
at org.apache.wicket.protocol.ws.api.WebSocketRequestHandler.<init>(WebSocketRequestHandler.java:59)
at org.apache.wicket.protocol.ws.WebSocketSettings.newWebSocketRequestHandler(WebSocketSettings.java:220)
at org.apache.wicket.protocol.ws.api.AbstractWebSocketProcessor.broadcastMessage(AbstractWebSocketProcessor.java:245)
at org.apache.wicket.protocol.ws.api.AbstractWebSocketConnection.sendMessage(AbstractWebSocketConnection.java:43)
at org.apache.wicket.protocol.ws.api.WebSocketPushBroadcaster$1.run(WebSocketPushBroadcaster.java:124)
at org.apache.wicket.protocol.ws.WebSocketSettings$SameThreadExecutor.run(WebSocketSettings.java:246)
at org.apache.wicket.protocol.ws.api.WebSocketPushBroadcaster.process(WebSocketPushBroadcaster.java:119)
at org.apache.wicket.protocol.ws.api.WebSocketPushBroadcaster.broadcastAll(WebSocketPushBroadcaster.java:109)
at com.starjar.engine.LoggedInUserTrackerActor.broadcastStats(LoggedInUserTrackerActor.scala:69)
at com.starjar.engine.LoggedInUserTrackerActor$$anonfun$receive$1.applyOrElse(LoggedInUserTrackerActor.scala:102)
at akka.actor.Actor$class.aroundReceive(Actor.scala:467)
at com.starjar.engine.LoggedInUserTrackerActor.aroundReceive(LoggedInUserTrackerActor.scala:31)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
at akka.actor.ActorCell.invoke(ActorCell.scala:487)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)
at akka.dispatch.Mailbox.run(Mailbox.scala:220)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

see
https://github.com/apache/wicket/blob/d9d142b0738e289e639165523c4190727e281519/wicket-native-websocket/wicket-native-websocket-core/src/main/java/org/apache/wicket/protocol/ws/api/AbstractWebSocketProcessor.java#L310